What is the difference between GPT-5.5 and Solar Pro 3?

GPT-5.5 is developed by OpenAI while Solar Pro 3 is developed by Upstage. GPT-5.5 has a 1.1M token context window vs Solar Pro 3's 128K. You can compare their actual outputs across 39 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.5 or Solar Pro 3?

It depends on your use case. GPT-5.5 and Solar Pro 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 39 challenges so you can judge which fits your needs best.

How much does GPT-5.5 cost compared to Solar Pro 3?

GPT-5.5 costs $5/M input tokens and Solar Pro 3 costs $0/M input tokens. Solar Pro 3 is $5.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5.5 and Solar Pro 3 on Rival?

This page shows a side-by-side comparison of GPT-5.5 and Solar Pro 3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Apr 2026

GPT-5.5vsSolar Pro 3

Solar Pro 3 is cheaper than GPT-5.5 at $0/M vs $5/M input tokens.

GPT-5.5 and Solar Pro 3 compared across 39 shared prompts
Spec	GPT-5.5	Solar Pro 3
Input price	$5/M tokens	Free
Output price	$30/M tokens	Free
Context window	1.1M tokens	128K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Apr 2026	Jan 2026